US1666038A - Method and apparatus for the manufacture of tire beads - Google Patents

Description

April 10, 1928. 1,666,038

S. W. ALDERFER METHOD AND APPARATUS FOR THE MANUFACTURE OF TIRE BEADS Filed May 28. 1926 I N V EN TOR. STEEL m4 W. flLflERFER.

' ATTORNEY.

Patented Apr. 10, 1928.-

UNITED STATES- PATENT OFFICE.

swarms w. Ann-Emma, or AKRON, 01:10.

METHOD AND APPARATUS FOR THE MANUFACTURE OF TIRE BEADS.

Application filed May 28, 1926. Serial No. 112,858.

These tire beads comprise a plurality of' la ers of wire tape which are impregnated with rubber and wrapped about. a circular form so as to constitute the reinforcement. A filler of rubber composition is usually added, the structure wrapped with fabric and then given a preliminary vulcanization to shape it to substantially its final form.

The present invention has to do with the construction of the wire reinforcement. Heretofore, two well known types of wire tape have been employed, one of braided tape in which a plurality of wires are braided together to form a fiat ribbon, and the other a woven tape in which a plurality of parallel wires are held in position by a light wire interwoven between the parallel wires and holding them in flat position.

Either of the methods of the prior art has certain disadvantages, both requiring spe-' cial machinery for the manufacture of the tape. Furthermore, the wire will oftentimes be forced into an angular position in the building of the bead, and as both of the earlier forms of tape are somewhat inflexi-' ble, these forms of tape are not entirely satisfactory and are improved upon by the method of manufacture herein illustrated.

The present invention has for its object the manufacture of a wire tape suitable forbuilding tire beads without a weavin or braiding operation, the wires being le directly from a plurality of separate supply reels and introduced into spaced relation into a rubber extruding machine having a die through which the wire strands pass out covered and surrounded by a mass of tenacious rubber composition which serves to hold the wires together. Before the wires are conducted into the die they are preferably given a preliminary bending or setting so that they will acquire a permanent set in substantially the circle in which they are to be incorporated, although it is. preferable to give them a somewhat smaller arc, the purpose of which is to cause the wires to remain in the proper position in the bead and to eliminate any tendency to separate or spring outwardly.

From the die the wire, coated and impreg mated with rubber composition, passes over cooling rolls or through cold water which will harden the rubber composition and also contribute to its maintaining the permanent curvature. It then passes over a compensator or storage rolls and on to the rotating bead ring or form. I

The essential feature of. the present inyention is theformation of a bead reinforcmg tape from a plurality of unconnected wires, led from separate sources and held 1n fixed relationship solely by the mass of rubber which is forced about and around the wires, the wires being given a set'or ben'd bywhich they will assume a fixed position in the bead structure and will not tend to fly out or separate from one another. The immediate cooling of the rubber' composition will assist in maintaining the compactness of the bead ring.

By forming the bead reinforcement in the manner described, all preliminary weavmg or braidin operations are dispensed with, and it wi 1 be possible for the manufacturer to construct bea'ds directly from wire in the spool. Furthermore, the fact that the wires pass from the covering or insulating machine without any connection between them other than afforded by the,

mass of rubber enables the tape to be laid at an angle upon the bead ring without distorting the tape.

Other advantages and benefits will be obtained by the method and apparatusfor the manufacture of beads as explained and set forth herein, which will be understood and appreciated by those skilled in this art, and while the description and drawings are specific in showing one form of the invention, it will be appreciated that other forms and embodiments may be made within the scope of the invention as set forth in the claims herein.

In the drawings:

Figure 1 is a plan view of a complete unit for the manufacture of the bead reinforcement by the improved method;

Figure 2 is a side elevation;

Figure 3 is an enlarged detail of the bending or setting rolls;

Figure 4 is an enlarged section through the extruding or insulating die, a portion of the rubber within the die being omitted to show more clearly the operation of the apparatus; and

Figure 5 is a cross-section of the tape. The wires for the formation of the bead reinforcement are indicated at 10. They are of any suitable number and are led from a plurality of reels or separated supplies 11.

These wires may be given a preliminary curvature or set before they are assembled uppn the rolls, but if not, or if the set is not of the right curvature or permanency, the wires are led between setting rolls 12 which are so set and adjusted as to cause the wire to conform to a circle similar to that which it will assume in the completed bead. It is preferable that this circle be of somewhat smaller diameter than the finished circle of the bead.

From the supplies the several wlres are conducted into the extruding or insulating machine. This is indicated generally by the numeral 15. The rubber compositionwhich is to be extended around and over the wires is of sufficient tenacity to hold the wires together in tape form. It is fed into the machine through the opening 16 from which it is forced by screw 16 to the die head or opening 17 The wires 10 enter the machine from the rear in alignment with the die opening, being spaced apart by a guide 18'. The wires are not in contact or in close proximity when they receive their initial coating of rubber, but are surrounded and encased by the rubber before being contracted to tape form.

This is accomplished by the spiralshaped born or guide 19 which is secured upon the guide 18. The sides of this horn are cut away, as shown at 20, to permit the mass of rubber to enter into the horn and surround and encase the wires before they are brought together. The wires converge toward the mouth 21 of the horn which is in alignment with and directly behind the die opening 17. At this point the tape receives an additional coating of rubber as it passes out of the die in the form shown in Figure 5.

By the arrangement illustrated in Figure 4, the rubber mass completely surrounds and encloses the wires as shown and the tape is given its permanency and form. The rubber is by this means thoroughly and completely forced in and around the wires and. is thereby better able to hold the wires together.

The tape, as formed in the die, is indicated at 25. In insulating or extruding machines of the type shown, the rubber is heated so that it will flow more freely and readily. It is therefore advisable to cool the rubber so as to give it a greater tenacity. In the present machine this is accomplished by passing the tape over a pair of cooling drums 26. These drums not onlychill the rubber but aid in giving the final set to the wires.

The tape then passes over compensator or incense The number of wires and their relationship may be varied within the discretion of the tire builder. The relation of the va rious steps may be attained and other changes may be made within the scope of the invention as will be appreciated by those skilled in the art.

What is claimed is:

1. A method of manufacturing beads for pneumatic tires, comprising the steps'of leading a plurality of separate wires from individual sources without weaving or braiding, imparting to the wires a curvature similar to that which they, will assume in the completed bead, extruding a mass of tenacious rubber composition about the wires, reducing the wires and the rubber to tape form, and winding the tape thus formed into a rin to constitute a reinforcement for the head.

2. A method of manufacturing beads for pneumatic tires, com rising the steps of leading a plurality of separate wires from individual sources, imparting to each wire a curvature similar to that which it will assume in the completed bead, extruding a mass of tenacious rubber composition about the wires, forming the wires and rubber into a tape, and winding the tape thus formed into a ring to constitute a reinforcement for the head.

-3. A method of manufacturing beads for pneumatic tires, com rising the steps of leading a plurality o separatewires from individual sources, imparting to each wire a curvature similar to that which it will assume in the completed bead, extruding a mass of heated tenacious rubber composition about the wires, forming the wires and rubber into a tape, cooling the tape, and winding the tape thus formed into a ring to constitute a reinforcement for the bead.

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4. A method of manufacturing beads for i tee bead, bringing the wires into parallel relationship and surrounding and encasing them into a mass of rubber, forming the wires and rubber into a tape, and winding the tape about a form to constitute the bead reinforcement.

6. A method of manufacturing beads for pneumatic tires, comprising the steps of giving the wiresa permanent curved set corresponding to the curvature of the completed bead, bringing the wires into parallel relationship without connecting said wires together and surrounding and encasing them in a mass of rubber, forming the wires and the rubber into a strip, and winding the strip about a form to constitute the bead reinforcement.

7. Apparatus for the manufacture of tire beads, comprising a plurality of sources of supply for separate wires, a device for imparting a permanent curvature in the wires corresponding to the curvature of the completed bead, an extruding machine for surrounding and encasing the wires in a mass of warm rubber to form a strip, cooling rolls about which the rubber and wires pass, and

a rotating form about which the strip is wrapped to form a bead.

8. Apparatus for the manufacture of tire beads, comprising a plurality of sources of supply for separate wires, a device for imparting a permanent curvature in the wires corresponding to the curvature of the completed bead, an extruding machine for surrounding and encasing the wires in a mass of rubber to form a strip, and a rotating form about which the strip is wrapped to form a bead.

9. Apparatus for the manufacture of tire beads, comprising a plurality of sources of supply for separate wires, a device for imparting a permanent curvature in the wires corresponding to the curvature of the completed bead, an extrudin machinefor surrounding and encasing the wires in a mass of warm rubber to form a strip, cooling rolls about which the. rubber and wires pass, a take-up device for the stri and a rotating form about which the strip is wrapped to form a bead.

STERLING W. ALDERFER.

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